This 14th century tower house was once the home of Irish poet W.B. Yeats.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

A moody and picturesque riverside ruin overgrown with vegetation.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The secret wartime bunker built on the platforms of an abandoned Tube station.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Experience what life was like in Ireland during the Viking and medieval ages.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

One of Ireland's most infamous prisons for rebels including men, women and children.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

A collection of biblical memorabilia.

This cheese shop also houses a museum devoted to Dutch dairy.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A floating cat sanctuary on an Amsterdam canal.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Museum preserving torture methods from the past.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Amsterdam's Red Light District leaves little to the imagination.